Disclosure: referral codes and links on this page may earn the site owner a reward from the plasma center. Rewards are set by each center and are generally paid to the referring donor, not the new donor. Figures are estimates or advertised maximums and vary by center. Full disclosure. Not medical advice: eligibility is decided by the center's medical staff.
By PlasmaPromoCode · Updated October 1, 2026
Minimum 110 lbs. No maximum. Heavier donors earn more per visit.
To donate plasma, you must weigh at least 110 pounds (50 kg). This is universal - every plasma center in the US follows this FDA-guided minimum, including CSL Plasma, BioLife, Grifols, and Octapharma.
There is no maximum weight limit. In fact, heavier donors earn more money per visit because they can safely donate a larger volume of plasma. Most centers use a tiered pay system based on weight.
The amount of plasma collected from each donor is based on their weight. This is an FDA requirement designed to ensure donor safety - the amount taken must be proportional to the donor's blood volume, which correlates with body weight.
| Weight Tier | Plasma Collected | Donation Time | Relative Pay |
|---|---|---|---|
| 110-149 lbs | ~690 mL | ~40-50 min | Base rate |
| 150-174 lbs | ~825 mL | ~50-60 min | +$5-$10 more |
| 175+ lbs | ~880 mL | ~55-65 min | +$10-$15 more |
The exact volumes and tier boundaries vary slightly between plasma centers, but most follow this general structure. The FDA sets maximum collection volumes based on weight to ensure donor safety.
Because heavier donors give more plasma, they're compensated more. The difference isn't huge - typically $5-$15 more per visit - but it adds up over time. If you donate twice per week, being in the 175+ lb tier could mean an extra $40-$120 per month compared to the lightest tier.
For detailed pay rates, see our CSL Plasma Pay Chart and How Much Does Plasma Pay? guides.
| Center | Minimum Weight | Maximum Weight | Weight Tiers |
|---|---|---|---|
| CSL Plasma | 110 lbs | None | 110-149, 150-174, 175+ |
| BioLife | 110 lbs | None | 110-149, 150-174, 175+ |
| Grifols / Biomat | 110 lbs | None | 110-149, 150-174, 175+ |
| Octapharma | 110 lbs | None | Similar tiers |
All major centers follow the same FDA guidelines for minimum weight and volume tiers. The specific pay rates for each tier vary by center and location.
🆕 Meet the requirements? CSL Plasma has a referral code (CSL's $100 reward goes to the referring donor):
Tap the code to copy · Enter in CSL Plasma app → Referrals
The 110-pound minimum isn't arbitrary - it's based on blood volume physiology:
Your body regenerates plasma quickly (usually within 24-48 hours), which is why you can donate twice per week. But removing too much at once relative to your body size can cause dizziness, fainting, or more serious complications.
If you're right around the 110 lb threshold, here are some practical things to know:
Plasma centers weigh you before every single donation. This means your weight needs to be 110+ lbs each time you visit, not just on your first visit. If your weight fluctuates around this threshold, you may be turned away on days you're under 110.
While there's no formal BMI requirement for plasma donation, your overall health assessment includes looking at height and weight together. Here's what that means in practice:
There's no height requirement for plasma donation. Whether you're 4'10" or 6'5", you can donate as long as you meet the 110 lb weight minimum and pass the health screening.
If you're significantly underweight for your height, the medical staff may ask additional questions about your health during screening. Being underweight isn't automatically disqualifying, but it can indicate underlying health conditions that might affect eligibility. The 110 lb minimum is the hard cutoff.
Being overweight or obese does not disqualify you from plasma donation. In fact, as noted above, heavier donors earn more. The practical considerations are:
Let's break down the actual earnings difference between weight tiers. These are approximate numbers for new donors at CSL Plasma:
| Weight Tier | Per Visit (New) | Per Visit (Regular) | Monthly (2x/week) | Yearly Estimate |
|---|---|---|---|---|
| 110-149 lbs | $75-$90 | $45-$55 | $360-$440 | $4,320-$5,280 |
| 150-174 lbs | $80-$95 | $50-$65 | $400-$520 | $4,800-$6,240 |
| 175+ lbs | $85-$100 | $55-$75 | $440-$600 | $5,280-$7,200 |
Rates vary significantly by location. These are national averages. Referral code U2M3CEACL4 for new donors.
The difference between the lowest and highest weight tier can be $80-$160 per month if you donate consistently. Over a year, that's up to $1,920 more just for being in the heaviest tier.
Weight is just one requirement. Here's the complete picture of what you need to donate plasma:
For a complete first-visit walkthrough, see our First-Time Donor Guide.
Some donors wonder if gaining weight to move up a tier is worth it. Here's a realistic look:
If you naturally weigh close to 150, small fluctuations might move you between tiers. A heavy meal and good hydration before your visit can sometimes push you over if you're within a couple of pounds. But deliberately gaining significant weight just for plasma pay isn't advisable for health reasons.
Same principle. If you're naturally close to 175, hydration and a full stomach might get you there. But the $5-$15 per visit difference isn't worth compromising your health over.
⚕️ Not medical advice. Weight requirements and pay rates vary by center and location. Contact your local plasma center for their current policies and compensation structure.