Beta-hCG (Pregnancy Blood Test)#

Beta-hCG is a hormone produced by the cells that will become the placenta, beginning around 6 to 8 days after a fertilized egg implants in the uterus. It is unique to pregnancy in most cases - rare exceptions exist (certain tumours, hormone supplementation), but these are uncommon.

Blood and urine pregnancy tests both look for beta-hCG. They differ in how sensitive they are.

For most people, a pharmacy urine test is sufficient and is what family doctors' offices use. A blood test is only needed in specific situations.

• Qualitative - simply reports positive or negative.
• Quantitative - reports an exact number in IU/L. This is what TeleTest offers and is more useful, because the same blood draw can both confirm pregnancy and provide a baseline for follow-up if needed.

• Early confirmation of pregnancy before a missed period or when urine tests have been ambiguous (faint lines)
• Documented proof of pregnancy required by some abortion programs, fertility clinics, or surgical pre-procedure requirements (the lab result is sufficient documentation - a doctor's letter is usually not needed)
• Monitoring an early pregnancy when there is a specific concern (such as a history of repeat miscarriage), with two tests 48 hours apart to confirm a "doubling pattern" that suggests a viable pregnancy
• Peace of mind when multiple urine tests have been done but a number is wanted for clarity

• Confirming routine pregnancy - a urine test is enough
• Estimating how far along you are - blood hCG is unreliable after the first 2 to 3 weeks of pregnancy. The first day of your last menstrual period (LMP) or a dating ultrasound is more accurate.
• In place of a clinician visit when you have urgent symptoms (see urgent-care list below)

Go to a clinic or emergency department in person if you have any of:

• Severe lower abdominal pain (especially one-sided)
• Vaginal bleeding (more than spotting)
• Fever
• Shoulder-tip pain (a sign of internal bleeding from an ectopic pregnancy)
• Dizziness, fainting, or weakness
• A positive pregnancy test with previous tubal surgery, pelvic inflammatory disease, prior ectopic, or fertility treatment - any of which raise ectopic risk and need ultrasound assessment

These symptoms can signal an ectopic pregnancy (a pregnancy growing outside the uterus) or miscarriage. Both can be medical emergencies. Telehealth cannot evaluate these.

If you are pregnant and want to continue the pregnancy, contact a primary-care provider (family doctor, nurse practitioner, midwife) or a maternity clinic to arrange prenatal care. Early prenatal visits typically include bloodwork, an ultrasound for dating, and counselling on prenatal supplements.

If you are pregnant and considering ending the pregnancy, our contact form can direct you to resources. TeleTest does not currently provide abortion care.

No. Beta-hCG does not require fasting.

A blood beta-hCG can usually detect pregnancy about 7 to 10 days after conception, which is roughly when a period would be due. For someone tracking ovulation, that means testing about 10 to 14 days after sex.

If you test very early and get a negative result but still suspect pregnancy, repeat the test 5 to 7 days later.

• High-dose biotin (vitamin B7) supplements - follow your lab or clinician's advice; often 48 to 72 hours off biotin before testing is suggested, but the right interval depends on the dose, the lab assay, and how quickly your body clears it. Health Canada has confirmed that high-dose biotin can cause falsely high or low results on some lab assays.
• Recent injection of hCG (used in fertility treatment) - can cause a false-positive result for up to 10 to 14 days after the last dose.
• Heterophile antibodies (rare immune-system antibodies) - very occasional false positives. Your clinician can investigate this if a result is inconsistent with your clinical picture.

Most likely yes. A beta-hCG above 5 IU/L is considered a positive result in most labs. If the result is between 5 and 25 IU/L and you have no symptoms, the lab will often recommend a repeat test in 48 to 72 hours to confirm the rise.

If you have questions about a positive result, you can contact us or speak to a family doctor or walk-in clinic.

Possible reasons for a negative test in a true pregnancy:

• Tested too early - hCG is not yet high enough to detect. Repeat in 5 to 7 days.
• Irregular cycles or late ovulation - the timing window may be off compared to a typical 28-day cycle.

If the second test is still negative and you still have a missed period after 1 to 2 weeks, see a clinician in person to look for other causes (thyroid disease, polycystic ovary syndrome, weight changes, stress, perimenopause, or others).

Yes, but it is uncommon. The most common reason is testing too early. Less commonly, there is a "variant hook effect" in mid-pregnancy (around weeks 7 to 12) where very high hCG can trick the urine assay into reading negative. Studies estimate this happens in less than 1 in 200 cases.

If a urine test is negative but symptoms strongly suggest pregnancy, a blood test resolves the question.

Two beta-hCG measurements 48 hours apart can help assess whether an early pregnancy is progressing normally. The expected minimum rise depends on the starting level (AAFP):

• Starting hCG below 1,500 IU/L: rise of at least 49%
• Starting hCG 1,500 to 3,000 IU/L: at least 40%
• Starting hCG above 3,000 IU/L: at least 33%

These are minimum thresholds, not universal rules. CMAJ notes that a viable intrauterine pregnancy has been reported with a 48-hour rise as low as 53%, and that hCG trends alone cannot rule out an ectopic pregnancy.

A rise that is too slow, no rise at all, or a falling level can suggest a non-viable pregnancy or an ectopic pregnancy. Interpretation requires in-person follow-up with ultrasound and clinical assessment - the numbers alone cannot confirm an ectopic pregnancy or a healthy pregnancy.

Routine serial beta-hCG is not recommended for healthy early pregnancies without symptoms or specific concerns.

Ultrasound is far more accurate after the first 4 to 5 weeks of pregnancy. Typical ultrasound milestones:

• 4.5 to 5 weeks - gestational sac visible
• 5 to 6 weeks - yolk sac visible
• 5.5 to 6 weeks - cardiac activity detectable

Beta-hCG is only useful for dating in the very earliest weeks before ultrasound can see anything.

• Missed or late period
• Nausea, with or without vomiting
• Breast tenderness or fullness
• Unusual tiredness
• Increased urination
• Food cravings or aversions
• Mild lower abdominal cramping (similar to period cramps)

These symptoms can also occur with other conditions. A pregnancy test confirms the diagnosis.

The earliest a blood beta-hCG can reliably detect pregnancy is about 10 to 14 days after the sexual encounter. A urine test usually needs another 3 to 7 days. The simplest rule of thumb is to test when your next period would be due. If it is negative and your period does not arrive, repeat the test 5 to 7 days later.

If you had unprotected sex within the last 5 days and want to reduce the chance of pregnancy, see our Emergency Contraception page.

An ectopic pregnancy is a pregnancy that implants outside the uterus - most often in a fallopian tube. It is dangerous because the tube can rupture and cause severe internal bleeding. Symptoms include:

• One-sided lower abdominal pain
• Vaginal bleeding
• Shoulder-tip pain
• Dizziness or fainting

A positive pregnancy test combined with any of these symptoms is a medical emergency. Go to an emergency department immediately. Beta-hCG alone cannot rule out ectopic - ultrasound and in-person clinical assessment are needed.

Risk factors include previous ectopic, previous tubal surgery, pelvic inflammatory disease, intrauterine device (IUD) use, smoking, and assisted reproduction.

A miscarriage is the loss of a pregnancy before 20 weeks, most often in the first 12 weeks. Symptoms can include:

• Vaginal bleeding (light spotting up to heavy bleeding)
• Cramping
• Passing tissue
• A drop in pregnancy symptoms

Beta-hCG that is falling or rising too slowly can suggest miscarriage, but the diagnosis is confirmed by ultrasound and clinical assessment. If you have heavy bleeding, severe pain, fever, or feel faint, go to an emergency department.

Miscarriage is common (occurring in 10 to 20% of confirmed pregnancies) and is almost never caused by anything you did or did not do. Support is available through your primary-care provider, midwife, or community resources.

Arrange prenatal care as early as possible:

• Family doctor or nurse practitioner - your usual primary-care provider
• Midwife - if available in your province and you prefer midwifery care
• Maternity clinic - some regions have walk-in or community maternity clinics

Early prenatal care typically includes a dating ultrasound, prenatal bloodwork, prenatal vitamins (containing folic acid), and a discussion of lifestyle (alcohol, smoking, medications, food safety). Folic acid 0.4 mg per day from at least 2 to 3 months before pregnancy through the first trimester is recommended for all pregnancies.

It depends on the province and the clinical reason. In Ontario, beta-hCG is covered under OHIP for most pregnancy-related indications. Other provinces have their own billing rules. For elective, asymptomatic, or out-of-criteria requests, the test may be uninsured and the lab will charge a fee. Your TeleTest requisition and the lab's billing rules determine which applies.

Costs vary by lab. Contact your local lab for current pricing, or see your TeleTest booking confirmation.