The HOB medical abbreviation means head of bed, and it is almost always paired with a number or position that tells staff how high to raise the top of a hospital bed. An order such as HOB 30 degrees asks for the head end to be tilted up to about a 30 degree angle.
It looks like a small detail, but bed position is part of preventing choking on stomach contents, pneumonia in people on breathing machines, and pressure problems in the head after brain injury. You will see HOB in nursing orders, care plans and flow sheets. Here is how to read the common orders and why each one is used.
At a glance
Stands for
Head of bedWritten as
HOB 30, HOB >30°, HOB up, HOB flatCommon angles
About 30 to 45 degrees for many patientsWhere you see it
Nursing orders, care plans, ventilator checklistsRelated terms
OOB (out of bed), BRP (bathroom privileges)Specialty
Nursing, critical care, neurology, nutrition support
What the HOB medical abbreviation tells staff
Hospital beds bend in two places, at the head and at the knees. HOB refers only to the head section, and orders usually give an angle or a range. Nurses read the angle from a gauge on the side rail or on the bed control screen. The order says nothing about the knee section or whether the person can get up; those are covered by activity orders such as OOB or bed rest.
Because people tend to slide down in bed, staff recheck the angle and reposition the person through the shift.
Common head of bed orders, decoded
A few orders cover most of what you will see.
| Order | What it asks for | Common reason |
|---|---|---|
| HOB 30 degrees or more | Head raised to at least 30 degrees | Lower aspiration risk, often with tube feeding |
| HOB 30 to 45 degrees | A set range kept at all times | Part of ventilator pneumonia prevention bundles |
| HOB 30, head midline | Raised bed with the head straight | Helps blood drain from the head after some brain injuries |
| HOB flat | Bed kept level | After certain procedures, per the team's order |
| HOB raised for comfort | Raised as the person prefers | Easier breathing or eating |
Exact angles and timing come from each hospital's protocols and the clinician's order.
Why raising the head helps
Lying flat makes it easier for stomach contents to travel up and be breathed into the lungs, called aspiration. Keeping the head up is one of the steps used for people receiving tube feeds and for people on a breathing tube (ETT) to reduce the chance of pneumonia. A raised head can also make breathing more comfortable for someone with heart failure or lung disease.
Care plan line: "Maintain HOB >30° with continuous feeds, check residuals per protocol." The nurse keeps the head up whenever the feeding pump runs.
When the bed stays flat
Sometimes the order is the opposite. After certain procedures, such as removal of a sheath from the groin artery after a heart catheter procedure, the team may want the bed flat or low for a set time to protect the puncture site. Some spine conditions and some tests also call for a flat position. In the past, people were routinely kept flat after a lumbar puncture; practice now varies, so the order on the chart is what applies.
Post procedure order: "HOB flat x2 hours, then may raise to 30 degrees." The bed stays level for two hours before the head can come up.
Students and the HOB medical abbreviation in charting
Chart the actual angle you saw rather than only writing HOB up, and note any time the bed had to be lowered, such as for a turn or a bath. During feeds, pause the pump if the bed must go flat, following local policy. Pair HOB with other positioning and activity shorthand, such as BRP. The nursing abbreviations hub collects related order terms.
Positioning orders are written for one patient at a time. If you are caring for someone and unsure how to position them, ask their nurse before changing the bed.
Frequently asked questions
What does HOB 30 mean?
It means raise the head of the bed to about 30 degrees. It is a common order to lower the chance of breathing stomach contents into the lungs.
Why do nurses keep the head of the bed up?
A raised head helps keep stomach contents from moving into the airway, especially during tube feeding or when a person is on a breathing machine. It can also ease breathing.
What does HOB flat mean?
It means keep the bed level. It may be ordered for a period after certain procedures or for some spine or neurological conditions.
Can family members change the bed angle?
It is best to ask the nurse first, because the angle may be part of a medical order. The nurse can show which positions are fine for that person.