---
title: "Lab Work for Fatigue and Weight Gain: What to Check First"
description: "Lab work for fatigue and weight gain: start with thyroid, ferritin, fasting insulin/HOMA-IR, hs-CRP, and hormones. No referral needed."
canonical: "https://www.vitalsvault.com/blogs/lab-work-for-fatigue-and-weight-gain-what-to-check-first"
last-updated: 2026-08-22
---

# Lab Work for Fatigue and Weight Gain: What to Check First

> Lab work for fatigue and weight gain: start with thyroid, ferritin, fasting insulin/HOMA-IR, hs-CRP, and hormones. No referral needed.

---

Canonical HTML: https://www.vitalsvault.com/blogs/lab-work-for-fatigue-and-weight-gain-what-to-check-first
- [llms.txt](https://www.vitalsvault.com/llms.txt)
- [sitemap.xml](https://www.vitalsvault.com/sitemap.xml)
- [Developer portal](https://www.vitalsvault.com/developers)