Low Protein Deferrals: What They Mean and How to Fix Them

What protein level do plasma centers require?

Most plasma centers require a minimum total protein of 6.0 g/dL. Your level is measured via a small finger prick at the start of every visit.

What causes low protein?

• Low-protein diet — Most common cause; simply not eating enough protein-rich foods
• Donating too frequently — Even within legal limits, high-frequency donors can experience protein depletion
• Illness or stress — Can temporarily lower protein levels
• Overhydration — Drinking excessive water immediately before testing can dilute protein levels

Protein targets for plasma donors

Aim for at least 50–80 grams of protein per day, and try to eat a protein-rich meal 2–3 hours before donation (not immediately before).

Quick-boost protein sources

• Whey protein shake: 20–25g per serving
• 2 eggs: ~12g
• 3 oz chicken breast: ~25g
• 1 cup Greek yogurt: ~17g
• 1 cup cottage cheese: ~25g
• 1 cup lentils: ~18g

How long does a low protein deferral last?

A low protein deferral is typically 24–48 hours. Centers will usually let you return after a day or two if your levels have improved. Focus on getting 60–80g of protein in the 24 hours before your next visit.

When to talk to a doctor

If you're consistently being deferred for low protein despite adequate dietary intake, speak with your primary care doctor. Persistent low protein can sometimes indicate an underlying medical condition.