Labs and Diagnostics

ALT 50 blood test discussion between an adult patient and primary care clinician

ALT 50 to 100 on Your Lab Report, Explained Clearly

ALT 50 to 100 falls in the ACG's borderline or mild tier. One study found a single weightlifting session kept ALT raised for at least seven days.

ALT Normal Range blood test with healthcare professional performing a routine venous blood draw

Know Your ALT Normal Range When Labs and Experts Disagree

Your ALT normal range depends on who sets it: labs often print up to 36–40 U/L, while a 2002 study found healthy limits of 30 (men) and 19 (women).

ALT Blood Test result concern while adult reviews health information on a laptop

What Your ALT Blood Test Number Really Tells You

ALT blood test flagged high? One weightlifting session raised ALT for 7+ days in a study, one of several causes to rule out first.

Patient discussing Borderline TSH results with a clinician during a thyroid follow-up visit

Borderline TSH results and the right questions to ask

A borderline TSH is confirmed on a second test before treatment — guidelines repeat it
at two to three months. Here's what to ask in between.

Thyroid Disease discussion between an adult patient and clinician before testing

Know what the undiagnosed thyroid disease statistics show

Undiagnosed thyroid disease statistics get quoted everywhere. NHANES III tested 17,353 people and found 4.6% with hypothyroidism, mostly subclinical.

Thyroid Panel discussion between an adult patient and clinician during a medical consultation

How to Read Your Thyroid Panel and Check the Right Numbers

Reading a thyroid panel starts with TSH, not the value flagged in red. Free T4 comes next, and the range that decides your result is your own lab's.

Thyroid test accuracy shown with an adult performing an at-home finger-prick blood test

What at-home thyroid test accuracy really means for your TSH

At-home thyroid test accuracy splits in two: mail-in kits analyzed by a lab track vein-draw TSH closely, while rapid strip tests read at home do not.

TSH test cost during a routine blood draw at an outpatient laboratory

What a TSH test cost really looks like, insured or not

TSH test cost depends on one code: CPT 84443. Uninsured patients can request a
written estimate first, and dispute bills $400 over it.

Hashimoto's, TSH thyroid blood test with a healthcare professional collecting a routine blood sample

A clear read on TPO antibodies and TSH in Hashimoto’s

TPO antibodies and TSH answer different questions — one measures function, the other cause. NHANES III found 11.3% of US adults carry them. See the grid.

High TSH causes explored through thyroid testing and clinical evaluation

High TSH causes that are easy to overlook

High TSH causes are not all thyroid. Assay interference affects an estimated 0.05% to 6% of samples, depending on the platform used.

Test TSH blood test during routine thyroid monitoring in a clinical setting

Know How Often to Test TSH in Your Situation

TSH retest timing isn't one number. A borderline high result is usually repeated in 2–3 months, and many return to normal on their own.