Reference Range Table for hCG Normal Values

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.

Reference Ranges for Normal hCG Levels

Serum hCG measurement is a key indicator for early pregnancy detection. As assay methods and reagents vary among laboratories, reference ranges may differ. Some hospitals 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 strongly suggests pregnancy. Conversely, non-pregnant individuals typically exhibit levels below the lower limit of normal. For women wishing to continue the pregnancy, transvaginal ultrasound is recommended around gestational day 42 (approximately six weeks) 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-coitus. An hCG concentration exceeding 10 mIU/mL is considered diagnostic of pregnancy. Serum hCG testing is the fastest and most accurate method for pregnancy confirmation, with near 100% sensitivity and specificity. Once pregnancy is confirmed, it is advisable to undergo ultrasound examination 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. Fetal development should be assessed via ultrasound at approximately 12 weeks’ gestation.

Similarly, serum hCG testing must be performed strictly according to timing guidelines—typically no earlier than eight days after intercourse. We hope this information is helpful to you!