Had a gastric sleeve and think you’re all set after surgery? Think again.
Weight loss is just the beginning—your long-term health depends on regular blood work.
Here’s why routine lab tests are critical after bariatric surgery and exactly what to check for.
Why Is Blood Work So Important After Gastric Sleeve Surgery?
Gastric sleeve surgery changes how your body eats, absorbs, and stores nutrients. You eat less
food—and you absorb fewer vitamins and minerals. That means nutritional deficiencies can
develop quickly, even if you’re following the recommended diet.
Without regular lab monitoring, these deficiencies can go unnoticed and lead to:
- Fatigue
- Hair loss
- Weakness
- Nerve damage
- Mood changes
- Even long-term organ issues
How Often Should You Get Blood Work?
First year post-op:
- 3 months after surgery
- 6 months after surgery
After the first year:
- At least once a year—for life
(Some patients may require more frequent testing based on symptoms or past
deficiencies.)
Which Blood Tests Do You Need?
Here’s a checklist of the most important labs to monitor after gastric sleeve surgery:
Complete Blood Count (CBC)
- Screens for anemia or infection
Iron & Ferritin
- Low levels can cause fatigue and hair loss
Vitamin B12 & Folate
- Essential for nerve function, brain health, and red blood cells
Vitamin D & Calcium
- Critical for bone health and immune function
Electrolytes (Magnesium, Potassium, Sodium)
- Keep your muscles, heart, and nerves functioning properly
Liver & Kidney Function Tests
- Ensure these vital organs are handling the metabolic changes after surgery
Lipid Panel
- Check cholesterol levels, especially as your diet changes
A1C & Fasting Blood Glucose
- Important for diabetes screening and management
Thiamine (Vitamin B1)
- A deficiency can cause serious neurological problems if not detected early
The Risks of Skipping Blood Work
Just because you feel fine doesn’t mean everything is fine.
Many vitamin and mineral deficiencies are silent—they don’t cause noticeable symptoms until
the damage is done. By then, it may be harder to reverse.
Skipping blood work = risking your health long-term.
Final Thoughts
Blood work is not optional after bariatric surgery—it’s a lifelong tool to protect your energy,
strength, mental clarity, and overall well-being.
Getting your labs done on schedule means you’re taking full responsibility for your health and
your success.
When was your last blood test?