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Yes, fasting while menstruating can be safe for healthy adults if you feel well; pause or adjust if cramps, dizziness, or heavy flow worsen.

Yes—testing can still be valid; a repeat fasting draw is only needed in specific cases like markedly high triglycerides.

No, adding honey to fasting tea adds calories, so it breaks a standard intermittent fast.

No, fasting isn’t required for the nuchal translucency blood screening; eat and drink normally unless your clinician advises otherwise.

No, the 1-hour glucose screening in pregnancy doesn’t require fasting; only the longer diagnostic OGTT does.

No, fasting is usually not required for a parathyroid hormone blood test, unless your provider pairs it with other fasting labs.

No, fasting isn’t usually required for a parathyroid hormone (PTH) blood test; follow your lab’s instructions if fasting is requested.

No, fasting isn’t required for a pelvic ultrasound; you just need a full bladder unless it’s combined with an abdominal exam.

No, fasting isn’t needed for a prostate blood test (PSA); eat and drink as usual unless your clinic pairs it with other fasting labs.

No. PSA lab work doesn’t require fasting; timing, sex, biking, and infections affect PSA more than food.