How many donors do I need per sanguophage?

One healthy donor covers roughly one baseline sanguophage. Use two donors each if you chain abilities, travel often, or want a wider safety buffer.

Why do donors die when I try to farm hemogen manually?

Manual extractions stack blood loss. Blood loss becomes severe at 45 percent, extreme at 60 percent, and lethal at 100 percent, so the safe loop is to let the automatic hemogen farm timing wait for full recovery.

Do hemogen packs get used up by other jobs?

Keep them on a dedicated critical shelf and forbid pack ingestion for non-hemogenic pawns. Core production defs also blacklist hemogen packs from chemfuel feedstock.

Stop Babysitting: RimWorld Hemogen Farm Tool

RimWorld Biotech 1.6 Tool

Stop Babysitting: Build A Safe Hemogen Farm That Just Works

Fast answer: put one healthy prisoner in a compact medical cell, set Prisoner -> Hemogen farm, keep a dedicated medic on Doctor priority 1, and store packs on a critical shelf outside the door. One donor produces about 1 pack every 1.36 days, which is enough for one baseline sanguophage with room to spare. If you only need the shortest route, use the quick solution card below.

Jump To Quick Solution

Donor Planner Game File Anchors Sources

0.735 packs/day from one healthy donor

+20 hemogen per pack for hemogenic pawns

+45% blood loss per extraction

Quick Solution: The Set-And-Forget Setup

The shortest safe loop for stable hemogen with almost no babysitting.

1. Room Prep Use a 2x3 or 3x3 prison medical cell with a bed, full light, and a comfortable 15-26 C temperature band.
2. Policies And Storage Set one nearby shelf to Critical for hemogen packs only and forbid ingestion for non-hemogenic pawns.
3. Prisoner Interaction Set the prisoner to Hemogen farm so extraction requeues when blood loss reaches zero instead of chaining dangerously.
4. Priorities Keep one reliable medic at Doctor priority 1. Short walk distance matters more than fancy furniture here.
5. Feeds Use nutrient paste or simple meals so the donor never misses a meal and your kitchen does not become the bottleneck.
6. Output Expectation Plan on about one pack every 1.36 days from each donor. One donor usually covers one sanguophage; two donors each is safer for caravan or ability-heavy runs.

Manual danger: the local BloodLoss hediff turns severe at 0.45, extreme at 0.60, and lethal at 1.00, so the unsafe part is manual double-tapping, not the auto loop.

The Numbers

The ratios that decide whether your shelf stays full or drains before a raid.

Hemogen Pack Stats	Value
Hemogen value	+20
Blood loss from extract	+45%
Passive recovery	~33% / day
Safe interval	~1.36 days
Transfusion recovery	-35% blood loss
Spoilage	No rot; outdoors deteriorates

Donors	Packs/Day	Supports
1	~0.735	~1.47 base
2	~1.47	~2.94 base
3	~2.21	~4.41 base

Baseline sanguophage upkeep: about half a pack per day if you are not spending hemogen aggressively.

Emergency rule: keep 2-4 packs per bloodfeeder on a local hospital shelf before big fights or caravans.

Layouts And Logistics

Short paths, isolated storage, and zero-cross traffic matter more than raw room beauty.

rimworld hemogen farm minimal 3x3 donor cell layout — **Minimal 3x3 cell:** one bed, one light, one shelf route, and the shortest possible medic path.

rimworld hemogen farm hospital adjacent donor bay layout — **Hospital-adjacent bay:** better when you are running multiple donors and want packs close to transfusion beds.

Prisoner access only: keep one clean door in and no reason for idle colonists to wander through the room.
Storage inside the wing: a single critical hemogen shelf within roughly 10 tiles keeps hauling friction low.
Paste mouth works well: if you already run nutrient paste, feed donors inside the prison and remove kitchen traffic entirely.

Logistics And Safety Protocols

The boring rules that prevent prison breaks, accidental pack waste, and donor deaths.

# Hemogen Shelf
priority: Critical
allowed:
  - Hemogen pack
forbid_for_non_hemogenic: true
zone: Hospital Wing
target_buffer: 6-12 packs

Safety first: do not manually chain extractions unless you are deliberately gambling with blood-loss thresholds.
Mood control: keep pack use forbidden for non-hemogenic pawns so nobody grabs a gross snack and tanks mood.
Break control: if you have biotech gene tools available, calm or low-mobility donors reduce prison management noise.
Emergency triage: keep at least one hospital shelf loaded so transfusion is always two clicks away after a messy fight.

Scaling Up Ratios for 2, 4, and 6 bloodfeeders

Combat And Caravan Use How many packs to carry or shelf

Local Game File Anchors What the shipped files directly confirm

Hemogen Donor Planner

Use this when you need a quick answer for donors, buffer packs, and caravan stock.

This planner assumes one donor makes about 14.7 hemogen per day and each pack is worth 20 hemogen. The usage presets model different amounts of ability spending, not just passive upkeep.

Bloodfeeders Usage profile Shelf buffer days Caravan days

Daily Demand 28 hemogen

Donors Needed 2

Local Shelf Buffer 5 packs

Caravan Packs 6 packs

Plan 2 donors, keep 5 packs in the hospital wing, and bring 6 packs on the road.

Surplus with recommendation: 1.4 hemogen/day

Packs/day from donors: 1.47 packs/day

Local Game File Anchors

These are the shipped files and symbols that directly support the farm rules on this page.

Data/Core/Defs/ThingDefs_Races/Races_Humanlike.xml

Humanlike pawns gain ExtractHemogenPack and BloodTransfusion as surgery recipes when Biotech is present. That is the direct Def-level bridge between prisoners, extraction, and transfusion.

Data/Core/Defs/HediffDefs/Hediffs_Global_Misc.xml

The local BloodLoss hediff sets lethalSeverity = 1, marks severe at 0.45, and marks extreme at 0.60. That is why the auto-timed loop is safe and manual stacking is not.

Data/Core/Defs/RecipeDefs/Recipes_Production.xml

The Make_ChemfuelFromOrganics ingredient filter explicitly disallows HemogenPack, so your refinery bills will not silently burn packs as generic feedstock.

Contents/Resources/Data/Managed/Assembly-CSharp.dll

The assembly symbol table includes JobGiver_GetHemogen, JobDriver_PrisonerBloodfeed, WorkGiver_Warden_DeliverHemogen, Gene_Hemogen, Gene_HemogenDrain, and IngestionOutcomeDoer_OffsetHemogen. Those symbols confirm the runtime hooks for hemogen seeking, prisoner feeding, delivery, gene storage, drain, and ingestion gain.

Scaling And Caravan Use

Use these ratios when your colony stops being a one-vampire side project.

Bloodfeeders	Safe Donor Plan	Local Buffer
1	1 donor base / 2 if active	2-4 packs
2	2-3 donors	5-8 packs
4	4-6 donors	10-14 packs
6	6-8 donors	15-20 packs

Before raids: top off hemogen first, then let the local shelf catch up after the fight instead of tapping emergency reserve mid-combat.
Before caravans: baseline plan is roughly half a pack per day per sanguophage, then add more if the trip expects psycasts or blood-intensive abilities.
Modded play: extractor-building mods exist, but treat them as balance changes first and convenience second. Verify version support in your mod manager before trusting a live save.

FAQ

The issues that usually break otherwise good farms.

Why does the donor die when I micro extractions?

Because blood loss stacks faster than it naturally recovers. The safe loop is the automatic Hemogen farm timing, not manual back-to-back operations.

Do hemogen packs spoil?

They do not rot like food, but they still should stay indoors and on a proper shelf so your stock stays organized and ready for transfusion.

How many donors per sanguophage?

Use one donor for passive upkeep, then step up to two each if you expect raids, caravans, or frequent ability spending.

Why are pawns consuming packs I wanted to save?

Because the storage and ingest permissions are too broad. Fix the food or drug policy first, then move packs to a dedicated critical shelf.

Sources And Related Guides

Official references, community docs, and nearby guides you may need next.

Official And Community References

The quick math on this page follows current community-documented hemogen behavior and is cross-checked against local Def and assembly anchors where the shipped files expose them.