Hospital Chemical Lab and Hospital Chemical Lockers are two Rare keys in MW4 DMZ that belong together. Both are for the chemical lab in the basement of Mirae General Hospital, grid F5. The lab key opens the door, and each lockers key opens one of the three locked chemical lockers inside. Below is where both keys spawn, the order to use them in and everything we found in the lab and the lockers.
- Step 1. Get the Hospital Chemical Lab key. It spawns on the 7th floor of Mirae General Hospital, easiest to reach during Operation Critical Extraction.
- Step 2. Get one Hospital Chemical Lockers key for every locker you want to open. They spawn around the hospital, for example in the morgue.
- Step 3. Go down to the basement and open the Hospital Chemical Lab door with the lab key. The lockers key does not fit this door.
- Step 4. Inside, use a lockers key on one of the three padlocked yellow lockers. Each key opens one locker and was used up in our run.
- The three lockers held at least $8,400 in loot, including a 2-Plate Helmet Armor Vest Recipe worth $5,000. The rest of the lab held at least $4,700.
- Not worth it. The steps are a hassle and the loot does not make up for them.
Where the Hospital Chemical Lab Is
The Hospital Chemical Lab is in the basement of Mirae General Hospital, grid F5, the morgue level of the building. Come in through the front entrance, cross the lobby with the waiting room chairs and take the stairwell door with the stairs sign, one floor down. Follow the corridor with the green walls, and the lab is behind a brown wooden door with a narrow window and a jacket hanging on the wall next to it. Opening it paid 330 XP. The hospital was a Low threat area in our run. You can also find the door under the keys layer on our interactive MW4 DMZ map.
- Walk in through the front entrance of Mirae General Hospital and cross the lobby.
- Take the stairwell door with the stairs sign and go one floor down to the basement.
- Follow the corridor with the green walls and use the lab key on the brown wooden door with the jacket next to it.
Click to enlarge The lab door with the prompt, brightened. 
Click to enlarge The three locked chemical lockers inside the lab, brightened. 
How to Get the Hospital Chemical Lab and Lockers Keys
The Hospital Chemical Lab key spawns on the 7th floor of the hospital. On the landing with the big number 7 and the sign for offices 701 to 712, go through the wooden double doors, cross the lounge with the sofa and enter the office behind it. Ours lay on the desk next to the shredder and the desk lamp. As far as we know this is a set spawn. The 7th floor is easiest to reach while you run Operation Critical Extraction, the hospital mission, which is when we picked it up. Outside the mission some doors on the way up may be locked, but we have not checked that yet.
Click to enlarge The lab key on the desk, 7th floor. 
The Hospital Chemical Lockers key also spawns inside the hospital, and we have seen it in two spots. One lay on the lower shelf of a steel instrument table in the morgue, the room with the autopsy table near the elevators. Another lay on a lab bench next to a rack of test tubes. The key’s own description says it opens one of the chemical lockers sealed in the lab in the basement morgue. You need one key for every locker you want to open, so pick up every copy you find. Every other key and the door it opens is in our MW4 DMZ keys guide.
Click to enlarge A lockers key in the morgue, brightened. 
Click to enlarge A lockers key on a lab bench. 
The Order to Use the Keys In
This is where most players get stuck. The Hospital Chemical Lockers key looks like the key for the lab, but the lab door does not take it. The door has its own key, and the lockers key only works on the lockers inside. Do it in this order.
- Pick up the Hospital Chemical Lab key on the 7th floor.
- Collect one Hospital Chemical Lockers key for each locker you want to open, up to three.
- Go down to the basement and open the Hospital Chemical Lab door with the lab key.
- Use a lockers key on one of the three padlocked yellow lockers against the far wall. In our run each key was gone after one use, so every locker costs a key.
The single yellow locker right next to the lab door is not one of them. The game calls it a Cache, and it opens without a key.
What Is Inside the Lab and the Lockers
The lab is one storeroom with metal shelves along the walls. Before you touch the lockers there are three EMT bags around the room, the unlocked Cache by the door, and loose items on the shelves. Ours held two Epic Medkits, Smelling Salts, a Binding Catalyst and Detonators, with Infantry Invasion Plans and Reactive Metals lying loose. Counting only items with a known value, the room outside the lockers was worth at least $4,700.
Containers
The containers decide the loot. Tap one to see what it can drop in our loot data.
Loot
-
Medkit ×2 Epic $1,000 each EMT Bag -
Infantry Invasion Plans Uncommon $1,000 Loose in the room -
Binding Catalyst Rare $500 Cache -
Biomaterials Uncommon $200 EMT Bag -
Detonators ×3 Uncommon $200 each EMT Bag, Cache -
Reactive Metals Uncommon $200 Loose in the room -
Sedative Inhaler Uncommon $100 EMT Bag -
Stim Uncommon $100 EMT Bag -
Smelling Salts Rare EMT Bag -
Chemicals ×17 Cache
From one opening in our own run. Loot is random, so your room can roll differently, and we add every new run of this key. Values are per item, from the in-game tooltips. The loot value adds up every item with a known value and the cash, so it is a lower bound: crafting resources and items without a value are not in it.
The three chemical lockers are where the real loot is. The game calls them Chemical Storage, and each one was packed with Chemicals and Synthetics, plus a few medical items and Detonators. One held a 2-Plate Helmet Armor Vest Recipe worth $5,000, and the other two each gave a set of Ballistic Flight Logs worth $1,000. The loot in the three lockers was worth at least $8,400.
Containers
The containers decide the loot. Tap one to see what it can drop in our loot data.
Loot
-
2-Plate Helmet Armor Vest Recipe Rare $5,000 Chemical Storage -
Ballistic Flight Logs ×2 Uncommon $1,000 each Chemical Storage - Biomaterials Uncommon $200 Chemical Storage
- Detonators ×4 Uncommon $200 each Chemical Storage
-
Bandage ×2 Uncommon $100 each Chemical Storage -
Pain Killers Uncommon $100 Chemical Storage - Sedative Inhaler Uncommon $100 Chemical Storage
- Chemicals ×49 Chemical Storage
-
Metals ×11 Chemical Storage -
Synthetics ×17 Chemical Storage
From one opening in our own run. Loot is random, so your room can roll differently, and we add every new run of this key. Values are per item, from the in-game tooltips. The loot value adds up every item with a known value and the cash, so it is a lower bound: crafting resources and items without a value are not in it.
Click to enlarge The recipe in one of the lockers, brightened. 
Are the Hospital Chemical Lab and Lockers Keys Worth It?
Not worth it. The sequence of steps is a hassle. You need the lab key from the 7th floor, a separate key for every locker and then the trip down to the basement, and the loot does not make up for all that work. We were stuck on it for a while ourselves, because the lockers key alone does not open the lab door.
Frequently Asked Questions
Where is the Hospital Chemical Lab key in MW4 DMZ?
On the 7th floor of Mirae General Hospital. Go through the wooden double doors next to the big 7 and the Office 701 to 712 sign, cross the lounge and enter the office behind it. Ours lay on the desk next to the shredder. As far as we know this is a set spawn. The floor is easiest to reach during Operation Critical Extraction, the hospital mission.
Why does the Hospital Chemical Lockers key not open the Hospital Chemical Lab door?
Because the door has its own key. The Hospital Chemical Lab key opens the door to the lab in the basement, and only inside the lab can you use the Hospital Chemical Lockers key. It opens one of the three padlocked yellow lockers against the far wall. So you always need the lab key first.
Where is the Hospital Chemical Lab in MW4 DMZ?
In the basement of Mirae General Hospital, grid F5. Walk in through the front entrance, take the stairwell door in the lobby, the one with the stairs sign, one floor down, and follow the corridor with the green walls. The lab door is a brown wooden door with a jacket hanging on the wall next to it.
How many Hospital Chemical Lockers keys do you need?
One per locker. The lab holds three padlocked chemical lockers, and in our run every key was gone after one use. We brought three keys and opened all three lockers. The yellow locker next to the lab door is a Cache and needs no key.
What is inside the Hospital Chemical Lockers?
Mostly Chemicals and Synthetics, plus medical items and Detonators. In our three lockers we also found a 2-Plate Helmet Armor Vest Recipe worth $5,000 and two Ballistic Flight Logs worth $1,000 each. The loot in the three lockers was worth at least $8,400.
