Contamination in Labs: How Hormone Topicals Can Mislead
Avoiding Contaminated Hormone Lab Results: Timing, Application Sites, and Common Mistakes
Nurse Sophie Mengele and Duncan Turner, MD discuss how topical hormone replacement therapy can contaminate blood test results, leading to unrealistically high lab values that don’t match other markers like FSH. Using a recent patient example, they explain that contamination can occur when hormone cream is applied too close to a blood draw or transfers to the draw site, making results hard to interpret and requiring repeat testing. They recommend patients continue medications as usual but time labs about four hours after application, or if needed, hold only the morning dose so the last dose is about 12 hours prior rather than 24. They also advise consistent application in the same area to create a stable “reservoir,” using one hormone per area (often separate thighs), avoiding mixing multiple hormones in one syringe, and not applying right before showering or exercising.
00:00 Contamination Explained
00:17 Karen’s Lab Surprise
01:07 Timing Your Dose
02:06 Spotting Bad Results
03:34 Preventing Cream Transfer
04:04 Apply Consistently
05:05 One Hormone One Area
06:00 Showering and Exercise
06:39 Wrap Up
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