Normal Saline
Sodium chloride 0.9 percent (NSS)
Brand names:Normal Saline, NSS, 0.9% Sodium Chloride Injection
An isotonic crystalloid solution of 0.9 percent sodium chloride in water, used as the primary IV fluid in PA EMS protocols for volume resuscitation, medication delivery, and hydration. NSS is on the Required Medication List for PA IALS vehicles and is the default IV fluid throughout PA Statewide ALS and IALS protocols. Compatible with all EMS medications and preferred for traumatic head injury.
Pharmacology and Actions
NSS is an isotonic crystalloid (osmolarity 308 mOsm/L, slightly hypertonic to plasma at 285 mOsm/L). Infused intravascularly, the solution distributes between the intravascular and extracellular extravascular spaces in approximately 1:3 ratio, meaning about 25 percent of infused volume remains in the vascular space at 1 hour. NSS expands intravascular volume, replaces sodium and chloride losses, and serves as a vehicle for medication administration. The chloride content (154 mEq/L) is supraphysiologic and can produce hyperchloremic metabolic acidosis with large volume infusion.
Indications
- Hypovolemic shock from any cause (trauma, hemorrhage, dehydration)
- Maintenance fluid administration
- Medication delivery and IV access maintenance
- Traumatic head injury fluid resuscitation (preferred over LR)
- Hyperkalemia management (no potassium in NSS)
- Crush syndrome resuscitation per PA Protocol 6004
- Diabetic ketoacidosis initial resuscitation
- Hemodilution and electrolyte replacement
Absolute Contraindications
- Severe hypernatremia or hyperchloremia
- Congestive heart failure (relative; volume overload risk)
- Severe renal impairment with fluid overload
- Use as sole resuscitation fluid in massive transfusion (favor blood products and balanced solutions)
Precautions and Side Effects
Volume overload with pulmonary edema is the major concern, particularly in patients with heart failure or renal impairment. Hyperchloremic metabolic acidosis develops with large volume infusion (over 30 mL/kg in most adults) due to chloride content exceeding plasma levels. Hypothermia from rapid infusion of cool fluid; warm to body temperature when possible in trauma resuscitation. Dilutional coagulopathy with massive crystalloid resuscitation contributes to the lethal triad in trauma (hypothermia, acidosis, coagulopathy).
Adult Dosing
Pediatric Dosing
PA Protocol pediatric fluid dosing: 20 mL/kg IV/IO bolus for hypotension or shock, may repeat every 5 to 10 minutes to total 60 mL/kg before Medical Command. For trauma with hemorrhagic shock, titrate to age-appropriate permissive hypotension. Maximum 1000 mL initial dose before Medical Command in most PA protocols.
Pharmacokinetics
Peak Effect: IV: peak volume effect during and immediately after infusion
Duration: Approximately 25 percent of infused volume remains intravascular at 1 hour; redistribution to extravascular space over 1 to 2 hours
Storage and Handling
Store at controlled room temperature (15 to 30 degrees Celsius). Avoid freezing. Inspect for clarity and particulates before administration. Discard if cloudy or contaminated. Warming to body temperature improves trauma resuscitation outcomes.
Reconstitution:
Normal saline is supplied as ready-to-infuse bags in volumes from 50 mL to 1000 mL. No reconstitution required. Various concentrations exist (0.45 percent half-normal saline, 3 percent hypertonic saline) and must be carefully distinguished from 0.9 percent NSS before administration.
TCCC and TECC Role
Normal saline is the standard crystalloid in PA Statewide EMS Protocols and is on the Required Medication List for IALS vehicles. The drug is the workhorse fluid for IV access, medication delivery, and volume resuscitation. In TCCC contexts, NSS is acceptable for fluid resuscitation when blood products are not available, but the 2026 TCCC guidelines emphasize blood-based resuscitation over crystalloid for hemorrhagic shock. PA civilian protocols rely on NSS as primary because blood products are not typically carried on standard ALS units.
Normal saline is the IV fluid PA EMS providers reach for first because it is the protocol-mandated default, it is compatible with all EMS medications, and it is preferred for head-injured patients. The chloride load with large volume resuscitation is a real concern; modern trauma resuscitation doctrine favors balanced solutions (Lactated Ringers, Plasma-Lyte) when large volumes are needed, but PA protocols specify NSS as the default. For tactical and TEMS providers operating under PA scope, NSS is the right answer per protocol. Permissive hypotension targets (SBP 70 to 90) for uncontrolled hemorrhage without head injury align with current trauma resuscitation evidence.
Over-resuscitating with NSS in hemorrhagic shock, which produces dilutional coagulopathy, hyperchloremic acidosis, and worsens trauma triad mortality. PA protocols specify 1000 mL maximum before Medical Command for a reason. Modern trauma doctrine emphasizes blood products over crystalloid for ongoing hemorrhage. The other common error is using cold fluid for resuscitation; warm to body temperature when possible to avoid hypothermia compounding the trauma triad.
This drug profile is provided as educational reference material for trained medical providers. It is not medical advice, not a substitute for formal training, and not a substitute for current published guidelines or medical direction.
Drug administration is governed by your scope of practice, agency standing orders, medical director protocols, and applicable state and federal regulations. Controlled substances are subject to additional handling, accountability, and documentation requirements per DEA and state law. Always verify dosing, indications, contraindications, and route of administration against current published guidelines and your local protocols before administration.
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Drug information evolves. Last reviewed dates and source citations are provided for each entry. Confirm currency against the cited source before clinical use.
Penn Tactical Solutions publishes this reference for educational purposes. PTS does not provide medical direction and does not assume responsibility for clinical decisions made in the field. Clinical responsibility rests with the administering provider, their medical director, and their agency.
Educational reference for trained medical providers. Not medical advice. Not a substitute for formal training, current published guidelines, or medical direction. Drug administration is governed by your scope of practice, agency standing orders, medical director protocols, and applicable state and federal regulations. Controlled substances require additional storage, accountability, and documentation per DEA and state law.
In a medical emergency, call 911. This reference is not a substitute for emergency medical services.
Verify dosing, indications, and contraindications against current published guidelines and your local protocols before administration. Confirm content currency against the source citation. Penn Tactical Solutions does not provide medical direction. Clinical responsibility rests with the administering provider, their medical director, and their agency.
Normal Saline
| IV/IO | Hemorrhagic shock: titrate to permissive hypotension target (SBP 70 to 90) unless head injury, maximum 1000 mL before Medical Command in PA protocols. Hypovolemic shock from non-hemorrhagic cause: 500 mL IV bolus, may repeat to 2000 mL total per PA Protocol 7005. Pediatric: 20 mL/kg IV/IO bolus, may repeat to 60 mL/kg per protocol. Burn resuscitation per PA Protocol 6071: 20 mL/kg wide open for hypotension or 10 mL/kg over 1 hour for serious burns over 20 percent TBSA. (Immediate (volume effect begins with infusion)) |