Walk-in clinicians will run tests you ask for by name if the request is reasonable. Below is what to ask for, when, and why. Use the country switch in the header to see guidance tailored to Canada or the US.
Screens for anemia, infection, and blood-cell disorders. A cheap, high-value baseline.
"Can I get a CBC with differential? I don't have a family doctor tracking my baseline."
Baseline for kidney, liver, blood sugar, and electrolytes.
"I'd like a CMP — kidney function, liver enzymes, electrolytes, and glucose."
LDL is the strongest modifiable predictor of heart attack and stroke. Estrogen therapy can shift lipid profile — worth tracking.
"Please order a fasting lipid panel — total, LDL, HDL, and triglycerides."
Detects diabetes years before symptoms; A1c reflects 3 months of blood sugar.
"I'd like an A1c to screen for prediabetes and diabetes."
Thyroid disease is common and easily missed without testing.
"Can we check my TSH? Fatigue, weight changes, and mood can all trace back to thyroid."
Deficiency is very common in northern latitudes and easily corrected.
"Can we check my 25-hydroxy vitamin D level?"
Absorption drops with age; deficiency causes fatigue and nerve problems.
"Please add a B12 level."
Low iron is very common in people who menstruate and causes fatigue, hair loss, and brain fog.
"Can we add a ferritin to check my iron stores?"
Shared-decision test; can find early prostate cancer but also cause overtreatment. Long-term estrogen therapy lowers PSA — your clinician may interpret a 'normal' value differently.
"I'd like to discuss PSA testing — pros, cons, and whether it's right for me."
Curable with 8–12 weeks of pills — but silent for decades if untreated.
"Have I ever been screened for Hepatitis C? I'd like the one-time test."