Talmadge, J.
We are asked to determine if the State satisfied its duty as guardian ad litem of a child in a paternity action under the Uniform Parentage Act (UPA), RCW 26.26, where the man found to be the father had sexual intercourse with the mother near the time of the [348]*348child’s conception, resembled the child, and had a blood/ genetic test indicating a 99.41 percent likelihood of a match; however, another possible father was not located, joined in the action, or subjected to a blood/genetic test.
Where there is overwhelming evidence of paternity, including blood/genetic test results, testimony from the mother and alleged father regarding sexual relations near the time of conception, and evidence of a resemblance between the alleged father and the child, the State satisfies its duty as the child’s guardian ad litem under constitutional due process and RCW 74.20.310 to secure a swift and accurate determination of paternity even though another possible father is not joined in the action.
ISSUE
Did the State satisfy its duty as guardian ad litem for a child in a paternity proceeding where overwhelming evidence pointed to a man as the natural father, and another possible father was neither located nor joined in the action?
FACTS
Rebecca McMichael had sexual relations with two men at or near the time of conception of her daughter: Leon Fox, with whom she had lived off and on, and S.R. Mc-Michael claimed her sexual relations with Fox ended in July 1986; Fox admitted to sexual relations with Mc-Michael in May or June 1986. Nicole McMichael was born on April 9, 1987.
Ms. McMichael received public assistance from the State, and subsequently identified Fox as Nicole’s father. Ms. McMichael had also advised the State of S.R.’s identity after Nicole’s birth, but the State could not locate S.R.1 [349]*349Acting under RCW 74.20.310 as guardian ad litem for Nicole, the State filed a paternity action in the Mason County Superior Court on March 19, 1990 naming Fox as the alleged father.
Fox underwent blood/genetic tests performed by the Blood Center of Southeastern Wisconsin in accordance with medically accepted procedures. The tests indicated Fox’s probability of paternity to be 99.41 percent. Yet, when Fox had his blood drawn on November 14, 1990, he became aware of another possible father, S.R.
Based on the blood/genetic test results, the State filed a motion for summary judgment on November 20, 1991. Fox successfully resisted the motion for summary judgment, asserting his knowledge of S.R., another possible father, and indicating the State had not responded to his discovery requests concerning other potential fathers. In denying the State’s summary judgment motion on February 5, 1992, the trial court also ordered production of the information requested by Fox.
Counsel for Fox took Ms. McMichael’s deposition on February 11, 1992, when she testified to her relationships with Fox and S.R.
Prior to trial, the State moved in limine under RCW 26.26.1202 to exclude any reference to S.R. because he had not been joined as a party to the action.3 Fox objected, arguing the State was required to join all possible fathers. The State asserted it could not locate S.R., who was not a party to the action against Fox, and it was not obligated to join S.R. The State also asserted that Fox could have [350]*350joined S.R. The trial court granted the State’s motion, excluding any reference at trial to S.R.
Trial commenced on January 11, 1993. Fox’s blood/ genetic test results were admitted at trial without objection. In addition to the test results, other evidence of paternity appears in the record. McMichael stated she had had sexual intercourse with Fox without birth control near the appropriate time period for Nicole’s conception. McMichael did not have a menstrual period after having sexual intercourse with Fox. Although Fox denied he was Nicole’s father, he admitted at trial he had had sexual intercourse with McMichael around the time Nicole was conceived. McMichael listed Fox as the father on medical forms submitted to her physician in case of problems at birth. Utilizing photographs, the trial court found Nicole resembled Fox. McMichael stated, "Nicole looks just like her father,” referring to Fox.
The trial court determined Fox fathered Nicole and owed her a duty of support, but the Court of Appeals, Division Two, reversed and remanded for a new trial on the grounds that the State failed to adequately fulfill its duties as Nicole’s guardian ad litem. The Court of Appeals determined the trial court had jurisdiction under RCW 26.26.090 although the State had not joined S.R. as a possible father. Nevertheless, the Court reasoned that the State breached its duty as Nicole’s guardian ad litem in failing to take reasonable steps to locate and test other possible fathers, citing State v. Santos, 104 Wn.2d 142, 702 P.2d 1179, 70 A.L.R. 4th 1021 (1985), and State ex rel. Henderson v. Woods, 72 Wn. App. 544, 865 P.2d 33 (1994). State ex rel. McMichael v. Fox, 80 Wn. App. 941, 912 P.2d 518 (1996). We granted review.
ANALYSIS
Duties of the State as Guardian Ad Litem in Paternity Cases
Paternity actions under Washington law are governed
[351]*351by procedures set forth in RCW 26.26, the Uniform Parentage Act (UPA). See In re Custody of Brown, 77 Wn. App. 350, 352, 890 P.2d 1080 (1995); Gonzales v. Cowen, 76 Wn. App. 277, 281, 884 P.2d 19 (1994). RCW 26.26.040 provides for a presumption of paternity in certain instances such as birth of the child during marriage, taking the child into the home and openly holding the child out as his, or acknowledging paternity.4 Under the UPA, the child, natural mother, each presumptive father, and "a man or men alleged to be the natural father shall be made parties” to the paternity proceeding. RCW 26.26.090(1). The fact that all possible fathers have not been joined does not deprive the court of jurisdiction to determine paternity. RCW 26.26.090(3).5
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Talmadge, J.
We are asked to determine if the State satisfied its duty as guardian ad litem of a child in a paternity action under the Uniform Parentage Act (UPA), RCW 26.26, where the man found to be the father had sexual intercourse with the mother near the time of the [348]*348child’s conception, resembled the child, and had a blood/ genetic test indicating a 99.41 percent likelihood of a match; however, another possible father was not located, joined in the action, or subjected to a blood/genetic test.
Where there is overwhelming evidence of paternity, including blood/genetic test results, testimony from the mother and alleged father regarding sexual relations near the time of conception, and evidence of a resemblance between the alleged father and the child, the State satisfies its duty as the child’s guardian ad litem under constitutional due process and RCW 74.20.310 to secure a swift and accurate determination of paternity even though another possible father is not joined in the action.
ISSUE
Did the State satisfy its duty as guardian ad litem for a child in a paternity proceeding where overwhelming evidence pointed to a man as the natural father, and another possible father was neither located nor joined in the action?
FACTS
Rebecca McMichael had sexual relations with two men at or near the time of conception of her daughter: Leon Fox, with whom she had lived off and on, and S.R. Mc-Michael claimed her sexual relations with Fox ended in July 1986; Fox admitted to sexual relations with Mc-Michael in May or June 1986. Nicole McMichael was born on April 9, 1987.
Ms. McMichael received public assistance from the State, and subsequently identified Fox as Nicole’s father. Ms. McMichael had also advised the State of S.R.’s identity after Nicole’s birth, but the State could not locate S.R.1 [349]*349Acting under RCW 74.20.310 as guardian ad litem for Nicole, the State filed a paternity action in the Mason County Superior Court on March 19, 1990 naming Fox as the alleged father.
Fox underwent blood/genetic tests performed by the Blood Center of Southeastern Wisconsin in accordance with medically accepted procedures. The tests indicated Fox’s probability of paternity to be 99.41 percent. Yet, when Fox had his blood drawn on November 14, 1990, he became aware of another possible father, S.R.
Based on the blood/genetic test results, the State filed a motion for summary judgment on November 20, 1991. Fox successfully resisted the motion for summary judgment, asserting his knowledge of S.R., another possible father, and indicating the State had not responded to his discovery requests concerning other potential fathers. In denying the State’s summary judgment motion on February 5, 1992, the trial court also ordered production of the information requested by Fox.
Counsel for Fox took Ms. McMichael’s deposition on February 11, 1992, when she testified to her relationships with Fox and S.R.
Prior to trial, the State moved in limine under RCW 26.26.1202 to exclude any reference to S.R. because he had not been joined as a party to the action.3 Fox objected, arguing the State was required to join all possible fathers. The State asserted it could not locate S.R., who was not a party to the action against Fox, and it was not obligated to join S.R. The State also asserted that Fox could have [350]*350joined S.R. The trial court granted the State’s motion, excluding any reference at trial to S.R.
Trial commenced on January 11, 1993. Fox’s blood/ genetic test results were admitted at trial without objection. In addition to the test results, other evidence of paternity appears in the record. McMichael stated she had had sexual intercourse with Fox without birth control near the appropriate time period for Nicole’s conception. McMichael did not have a menstrual period after having sexual intercourse with Fox. Although Fox denied he was Nicole’s father, he admitted at trial he had had sexual intercourse with McMichael around the time Nicole was conceived. McMichael listed Fox as the father on medical forms submitted to her physician in case of problems at birth. Utilizing photographs, the trial court found Nicole resembled Fox. McMichael stated, "Nicole looks just like her father,” referring to Fox.
The trial court determined Fox fathered Nicole and owed her a duty of support, but the Court of Appeals, Division Two, reversed and remanded for a new trial on the grounds that the State failed to adequately fulfill its duties as Nicole’s guardian ad litem. The Court of Appeals determined the trial court had jurisdiction under RCW 26.26.090 although the State had not joined S.R. as a possible father. Nevertheless, the Court reasoned that the State breached its duty as Nicole’s guardian ad litem in failing to take reasonable steps to locate and test other possible fathers, citing State v. Santos, 104 Wn.2d 142, 702 P.2d 1179, 70 A.L.R. 4th 1021 (1985), and State ex rel. Henderson v. Woods, 72 Wn. App. 544, 865 P.2d 33 (1994). State ex rel. McMichael v. Fox, 80 Wn. App. 941, 912 P.2d 518 (1996). We granted review.
ANALYSIS
Duties of the State as Guardian Ad Litem in Paternity Cases
Paternity actions under Washington law are governed
[351]*351by procedures set forth in RCW 26.26, the Uniform Parentage Act (UPA). See In re Custody of Brown, 77 Wn. App. 350, 352, 890 P.2d 1080 (1995); Gonzales v. Cowen, 76 Wn. App. 277, 281, 884 P.2d 19 (1994). RCW 26.26.040 provides for a presumption of paternity in certain instances such as birth of the child during marriage, taking the child into the home and openly holding the child out as his, or acknowledging paternity.4 Under the UPA, the child, natural mother, each presumptive father, and "a man or men alleged to be the natural father shall be made parties” to the paternity proceeding. RCW 26.26.090(1). The fact that all possible fathers have not been joined does not deprive the court of jurisdiction to determine paternity. RCW 26.26.090(3).5
The UPA sets forth the evidence appropriate to establish paternity. Former RCW 26.26.1106 provided that
[e]vidence relating to paternity may include:
(1) Evidence of sexual intercourse between the mother and alleged father at any possible time of conception;
(2) An expert’s opinion concerning the statistical probability of the alleged father’s paternity based upon the duration of the mother’s pregnancy;
[352]*352(3) An expert’s opinion concerning the impossibility or the statistical probability of the alleged father’s paternity based upon blood test results;
(4) Medical or anthropological evidence relating to the alleged father’s paternity of the child based on tests performed by experts. If a man has been identified as a possible father of the child, the court may, and upon request of a party shall, require the child, the mother, and the man to submit to appropriate tests; and
(5) All other evidence relevant to the issue of paternity of the child.
Paternity proceedings brought under the UPA are civil actions governed by the rules of civil procedure. RCW 26.26.120(1); see State ex rel. Taylor v. Dorsey, 81 Wn. App. 414, 420, 914 P.2d 773 (1996); Woods, 72 Wn. App. at 549; State ex rel. Wise v. Taylor, 65 Wn. App. 395, 397, 828 P.2d 1143 (1992); State ex rel. Goodner v. Speed, 26 Wn. App. 648, 650, 613 P.2d 1207 (1980) (the UPA (RCW 26.26) has not converted filiation proceedings into a criminal prosecution), aff’d, 96 Wn.2d 838, 640 P.2d 13 (1982), cert. denied, 459 U.S. 863, 103 S. Ct. 140, 74 L. Ed. 2d 119 (1982). See also State v. Bowen, 80 Wn.2d 808, 810, 498 P.2d 877 (1972); State v. Schimschal, 73 Wn.2d 141, 144, 437 P.2d 169 (1968). The appropriate burden of proof in paternity actions under RCW 26.26 is a preponderance of the evidence. Dorsey, 81 Wn. App. at 420; Woods, 72 Wn. App. at 549; State ex rel. McGuire v. Howe, 44 Wn. App. 559, 569, 723 P.2d 452, review denied, 107 Wn.2d 1014 (1986).
Apart from the statutory requirements of the UPA, constitutional principles are involved in the determination of paternity. The overarching principle in paternity actions is the child’s constitutional right to due process associated with the determination of paternity. See Santos, 104 Wn.2d at 146-50. The touchstone for this constitutional right is the accuracy of the paternity determination. See Santos, 104 Wn.2d at 150; see also State v. Meacham, 93 [353]*353Wn.2d 735, 737-38, 612 P.2d 795 (1980) (the State’s interest in accurately determining the parentage of the children is compelling).
To effectuate the child’s constitutional right to an accurate determination of paternity, RCW 26.26.090(1) directs that the minor child shall in certain circumstances be represented by a general guardian or guardian ad litem. See RCW 26.26.090(1); RCW 74.20.310. In paternity actions like this case, where public support for the child has been paid, the State may act as guardian ad litem for the child pursuant to RCW 74.20.310.7 Two cases have discussed the duty of the State when acting as a guardian ad [354]*354litem under RCW 74.20.310, Santos, 104 Wn.2d 142, and Woods, 72 Wn. App. 544.
In Santos, decided under the older version of RCW 74.20.310, the putative father (Santos) and the mother (Montes), contemplating marriage, inquired at the prosecutor’s office how to establish Santos’ paternity of Montes’ child (Ambrosia). Santos and Montes believed paternity proceedings would be less expensive than adoption. Santos was advised of his right to an attorney and his right to have blood tests taken to determine paternity. Santos chose not to have blood tests taken and simply stipulated to paternity and to the judgment and order. Santos, 104 Wn.2d at 144. After a falling out with Montes, Santos sought to vacate the judgment and order of paternity. We vacated the judgment of paternity because the paternity proceeding failed to protect the interests of the child, id. at 143, noting that even where a party stipulates to paternity, an investigation is required to insure the accuracy of the determination of paternity. Id. at 149.
In Woods, Woods apparently acknowledged paternity of the child after viewing blood test results in open court, but there was no record of the paternity proceedings below including any supporting affidavit regarding the blood test. The Court of Appeals held Woods’ admission alone was insufficient to support an accurate finding of paternity as required under Santos. See Woods, 72 Wn. App. at 547-53 ("We are not able to determine, based on the record before us, if the State adequately investigated the possibility of other potential fathers or otherwise protected [the child’s] interests.” Id. at 551 (emphasis added)). In dicta, Woods went beyond Santos in requiring that an independent guardian ad litem be appointed if the State [355]*355failed to show "reasonable inquiry” to identify any other man who could have fathered the child.
If, on retrial, the State produces blood tests that indicate with near certainty that Woods fathered [the child], and further shows that after reasonable inquiry it was not able to identify any other men with whom [the mother] may have been sexually active around the time of conception, the Santos rationale would not require the appointment of a guardian ad litem. On the other hand, if the State fails to make the proper showing, the trial court must assure that [the child’s] due process interest is protected by the appointment of an appropriate guardian ad litem. Absent a record, we will not assume that the child’s interests were protected adequately by the State.
Woods, 72 Wn. App. at 555.
The Court of Appeals here, interpreting Santos and Woods, held "the State violated its duty as guardian ad litem by failing to test another possible father of whom it was aware or to provide an explanation of its failure to do so[,]” Fox, 80 Wn. App. at 942, and remanded the case "for a new trial with the appointment of a guardian ad litem to make reasonable efforts to locate S.R. and to obtain blood samples from him, if possible.” Id. at 946-47. The Court of Appeals, relying on Woods, opined "if the State functions in the capacity of guardian ad litem, it has an affirmative duty not only to identify, but to show to the court reasonable efforts to locate any possible fathers. If it fails to make the requisite showing, the trial court must appoint a separate guardian.” Id. at 944-45.8
The Court of Appeals has incorrectly extrapolated from Santos a requirement that the State, when acting as [356]*356guardian ad litem under RCW 74.20.310, must make a showing of reasonable efforts to locate and test other possible fathers, or an independent guardian must be appointed to do so. See Woods, 72 Wn. App. at 555; Fox, 80 Wn. App. at 944-45.
In Santos, we were concerned with the accuracy of the paternity determination in the context of the potential conflicting interests of the State in securing support for the child and the child’s interest in an áccurate determination of paternity:
"[i]t is in the child’s interest not only to have it adjudicated that some man is his or her father and thus liable for support, but to have some assurance that the correct person has been so identified. When the state initiates paternity proceedings, whether on behalf of the mother ... or the child . . . the state owes it to the child to ensure that an accurate determination of parentage will be made.”
Santos, 104 Wn.2d at 149-50 (citations omitted) (emphasis added). In holding the State failed to protect the interests of the child the Court noted "[a] prudent guardian for the child would not blindly accept an admission of paternity from one of several potential fathers without further investigation and scientific evidence of paternity!,]” id. at 150, and offered guidelines addressing the particular facts before it.
Since many nonfathers tend to admit paternity on the basis of mistake or threats, at least a cursory check into available anthropological and biological evidence of paternity is essential. The State should at least identify whether other potential fathers exist (1) by asking the natural mother whether she had sexual relations with any other men within 1 month before or after the calculated date of conception; and (2) by comparing the physical characteristics of the father, child, and mother. . . . [R]outine employment of blood grouping tests to exclude biologically impossible fathers is also desirable when a question as to paternity is raised by preliminary inquiry.
Id. at 150 (citations omitted). Regarding the need for an independent guardian ad litem, we stated:
[357]*357RCW 74.20.310 provides authority for the trial court to appoint a guardian ad litem when necessary. Appointment is necessary in a situation such as this, where there was no scientific proof of parentage and more than one potential father could have been identified with minimum investigation.
Id. at 150 (emphasis added).
In the present case, the State satisfied its duty-while acting under RCW 74.20.310 as Nicole’s guardian ad litem, given the overwhelming evidence it had accumulated as to Fox’s paternity of Nicole. In particular, the State satisfied its duty under Santos when it had evidence from McMichael and Fox of sexual relations at or near the appropriate time for Nicole’s conception and that Ms. McMichael had no menstrual period after her relations with Fox,9 evidence of physical similarities between Fox and Nicole,10 and blood/genetic test results.11 11 Moreover, the record does not evince a physical incapacity by Fox or McMichael to conceive a child.12 Given the civil burden of [358]*358proof in paternity actions, the State plainly met its burden under the UPA.
Unlike Woods, this is not a case of the complete absence of a trial record on paternity. Neither is it a case like Santos where nothing in the record supported a possible father’s admission of paternity. Santos requires "that the procedures of a paternity determination ensure accuracy.” Santos, 104 Wn.2d at 150. The guidelines of Santos were followed here. The State did inquire about other sexual relations the mother had around the time of conception, the physical characteristics of Pox and the child were compared, and blood/genetic tests were performed. Unlike the circumstances in Santos and Woods, overwhelming evidence in the record indicated Fox to be the natural father of the child. Since there was scientific proof of parentage, no independent guardian ad litem was even required, Santos, 104 Wn.2d at 150, and the State did not breach its duty when acting as Nicole’s guardian ad litem under RCW 74.20.310.13
For purposes of analyzing whether the State has satisfied its duty to protect the constitutional rights of a child in a paternity action when acting as the child’s guardian ad litem under RCW 74.20.310, we reaffirm the Santos test. We disapprove of the requirement articulated by the Court of Appeals in Woods and in this case that the State is required to make a showing of diligent efforts to locate any and all possible fathers. The State satisfies its duty to the child to assure an accurate determination of paternity if it accumulates overwhelming evidence pointing to a particular man as the father of the child.14 That man is, of course, free to join other potential fathers of the child pursuant to RCW 26.26.090(2).
Ultimately, we believe the requirement of a showing of [359]*359an effort to locate all other possible fathers may work against the constitutional interest of the child, if the evidence points to one man as the father. Where the State must delay a paternity proceeding to investigate several unlikely, but possible, fathers, even though the State may have sufficient evidence to establish the paternity of an identified and accessible alleged father, the child is deprived of the swift and accurate determination of paternity which due process compels.15
CONCLUSION
A child has a constitutional right to a swift and accurate determination of paternity. When the State acts as the child’s guardian ad litem under RCW 74.20.310, it satisfies its duty to protect the child’s right by evaluating the paternity of possible fathers, as we articulated in Santos. If the State accumulates overwhelming evidence that a particular man is the child’s father, the State is not obliged to locate and join in the paternity action every other possible father of the child to satisfy its duty. The Court of Appeals is reversed and the trial court’s determination of paternity is reinstated.
Durham, C.J., and Dolliver, Smith, Guy, Johnson, Madsen, Alexander, and Sanders, JJ., concur.