Reference Range Table for hCG Normal Values
Aug 24, 2022
Source: Cainiu Health
Dr. Lv Aiming
Introduction
Serum hCG is a marker used to determine the presence of early pregnancy. As test kits vary among hospitals, reference ranges also differ. Some hospitals use a reference range of 0–3.8 mIU/mL, others 0–5 mIU/mL, 0–15 mIU/mL, or 0–20 mIU/mL. Regardless of the specific reference range, a serum hCG level exceeding the upper limit of normal for that laboratory indicates pregnancy.
HCG, or human chorionic gonadotropin, is a hormone secreted during pregnancy. Typically, fertilization occurs approximately one week after conception, followed by implantation of the blastocyst into the uterine cavity; HCG secretion begins shortly thereafter. What, then, is the reference range for normal HCG levels?
Reference Range for Normal HCG Levels
Serum HCG measurement is a key indicator for diagnosing early pregnancy. As assay methods and reagents vary among hospitals, reference ranges also differ. Some institutions use a cutoff of 0–3.8 mIU/mL, others 0–5 mIU/mL, 0–15 mIU/mL, or 0–20 mIU/mL. Regardless of the specific reference range used, an HCG level above the upper limit of normal in a blood test generally indicates pregnancy. Conversely, non-pregnant individuals will typically exhibit HCG levels below the lower limit of the reference range. For women wishing to continue their pregnancy, an ultrasound examination is recommended around gestational day 42 to confirm intrauterine pregnancy and rule out ectopic pregnancy.
To confirm pregnancy early after intercourse, serum HCG testing can be performed as early as day 10 post-intercourse. An HCG level exceeding 10 mIU/mL is considered positive for pregnancy. Serum HCG testing is the fastest and most accurate method for confirming pregnancy, with near 100% diagnostic accuracy. Once pregnancy is confirmed, an ultrasound examination should be scheduled 7–10 days after the expected onset of the missed menstrual period to verify the presence of an intrauterine gestational sac and exclude ectopic pregnancy. Around week 12 of gestation, further ultrasound evaluation is advised to assess fetal development.
Similarly, serum HCG testing must be performed strictly according to timing guidelines—typically no earlier than eight days after intercourse. We hope this information proves helpful!
