Human Chorionic Gonadotropin (hCG) in Serum or Plasma for Pregnancy Confirmation

Why Is This Test Done?

Your healthcare provider may recommend an hCG test if you suspect you might be pregnant, especially if you’ve missed your period or experienced other early pregnancy symptoms like nausea or breast tenderness. Blood tests are often used for early and more accurate confirmation, particularly in cases where timing or other factors might affect urine test results.

When Is This Test Typically Ordered?

Blood hCG tests are often performed as early as 7–10 days after ovulation or conception, sometimes even before a missed period. Urine tests (if applicable) may be ordered later in pregnancy or if blood results are needed for specific clinical reasons. Always follow your provider’s instructions for timing.

What Does an hCG Test Measure?

The test detects the presence of hCG, a hormone that signals the development of a pregnancy. Levels vary throughout pregnancy, rising quickly in early stages and then stabilizing. Elevated levels can also occur in conditions like ectopic pregnancy or molar pregnancy, so results are interpreted in context with clinical findings.

What Are the Possible Results?

Results may be categorized as negative (no pregnancy detected), positive (indicating pregnancy), or indeterminate (needing further testing). Blood tests are more sensitive and can detect hCG earlier than urine tests. Always discuss results with your healthcare provider.