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General product information from regulator-hosted labels; this is not medical advice and gives no dosing or administration guidance.
Short answer
Normal saline is 0.9% w/v sodium chloride in water: 0.9 g per 100 mL, which is 9 g per litre or 9 mg per mL. Labels express its sodium and chloride as about 154 mEq/L (a Canadian label) or about 150 mmol/L (an Irish SPC), and report a calculated osmolarity near 308 to 310 mOsmol/L. Those numbers describe one strength, written in different units. The figures come from Canadian labels (B. Braun and Hikma) and an Irish product summary (HPRA).
What “normal saline concentration” means
The phrase refers to the strength printed on the container: sodium chloride dissolved in Water for Injection. A B. Braun prescribing information hosted in the Health Canada drug product database (dated August 24, 2020) states: “Each 100 mL … contains: Sodium Chloride USP 0.9 g; Water for Injection USP qs.” The Irish HPRA Summary of Product Characteristics for Sodium Chloride 0.9% w/v Solution for Injection (revision July 2015) states: “Each ml contains 9 mg sodium chloride.” Both sentences describe the same concentration. For the product itself, see what 0.9% sodium chloride is and which formats it comes in.
The same strength in four units
| Expression | Value | Where it comes from |
|---|---|---|
| Percent weight/volume | 0.9% w/v (0.9 g per 100 mL) | B. Braun label; HPRA SPC |
| Mass per volume | 9 mg per mL (equal to 9 g per L) | HPRA SPC states 9 mg per mL; 9 g per L is the same figure by unit conversion |
| Ion concentration | Sodium 154 mEq/L and chloride 154 mEq/L | B. Braun label |
| Ion concentration, SI units | 0.15 mmol per mL of Na+ and Cl-, stated as 150 mmol per litre | HPRA SPC |
| Calculated osmolarity | 310 mOsmol/L | B. Braun label |
| pH | 5.6 (range 4.5 to 7.0) | B. Braun label |
The Hikma Canada label discussed on the 0.9% sodium chloride guide gives 9 g/L, 154 mmol/L and 308 mOsmol/L, so published osmolarity for the same strength runs from 308 to 310 depending on the label.
Worked conversion (arithmetic, not a label statement)
0.9 g per 100 mL multiplied by 10 gives 9 g per L. Dividing 9 g by the molar mass of sodium chloride, taken here as 58.44 g/mol, gives about 0.154 mol, or 154 mmol per litre. For sodium and chloride, which carry one charge each, one mmol equals one mEq, so 154 mmol/L and 154 mEq/L are the same quantity. The 150 on the Irish SPC is the same value rounded, which is why “154” and “150” both appear for one product. Using a sodium atomic mass of 22.99 g/mol, 154 mmol of sodium is about 3.5 g of sodium per litre; this is calculated from the labelled concentration, not printed on the labels cited here.
Sodium content of normal saline
Per the labels cited, each litre supplies sodium at 154 mEq (Canadian label) or about 150 mmol (HPRA SPC), with an equal amount of chloride. Per mL that is 0.15 mmol of each ion on the SPC.
Is normal saline isotonic?
Yes, according to the labels cited: the B. Braun label describes the solution as “sterile, nonpyrogenic, isotonic and contains no bacteriostatic or antimicrobial agents”, and the HPRA SPC describes it as iso-osmotic with plasma and as physiological saline of approximately 150 mmol sodium and chloride per litre. The osmolarity on the label is calculated from the ingredients, so it can differ by a few mOsmol/L between labelers. The method is explained in how to calculate osmolarity.
What to check on the label when comparing products
- Strength statement: grams per 100 mL or mg per mL, so the percent and the mass agree.
- Ion units: mEq/L or mmol/L. Both appear in the sources above; do not read 154 against 150 as a different strength.
- Calculated osmolarity and pH range: the labels cited give 308 to 310 mOsmol/L and a pH range of 4.5 to 7.0.
- Preservative statement: the B. Braun label states the product contains no bacteriostatic or antimicrobial agents.
- Product type: other 0.9% products, such as flush syringes or irrigation bottles, carry their own labeling and strength statements; see saline flushes and irrigation supplies.
- Document date: both labels cited carry a date (August 2020 and July 2015), so note the date of any document you compare. Container types are covered in what an IV bag is and IV bag fluid types.
Common misunderstandings
“Normal saline percent” and “0.9 percent” are two ways to say one thing
The percent is w/v, grams of solute per 100 mL of solution. It does not mean 0.9% of the weight of the product.
Different numbers on different labels do not mean different products
Differences such as 308 versus 310 mOsmol/L or 150 versus 154 mmol/L come from how each labeler states the same 9 g/L composition.
FAQ
How much sodium is in normal saline?
About 154 mEq per litre on a Canadian label, or about 150 mmol per litre on the Irish SPC; 0.15 mmol per mL. Converting by arithmetic, that is roughly 3.5 g of sodium per litre.
What is the normal saline percentage?
0.9% w/v sodium chloride, equal to 0.9 g per 100 mL or 9 g per litre.
Is normal saline isotonic?
The labels cited describe it as isotonic or iso-osmotic with plasma, with calculated osmolarity of 308 to 310 mOsmol/L.
Sources
- B. Braun Medical Inc., 0.9% Sodium Chloride Injection USP, Prescribing Information, date of preparation August 24, 2020 (Health Canada-hosted PDF): https://pdf.hres.ca/dpd_pm/00058824.PDF. Checked 2026-11-01.
- HPRA (Ireland), Summary of Product Characteristics, Sodium Chloride 0.9% w/v Solution for Injection, PA 0073/105/001, revision July 2015: https://assets.hpra.ie/products/Human/14385/LicenseSPC_PA0073-105-001_23072015120047.pdf. Checked 2026-11-01.
- Hikma Canada label figures as summarised in the CASRAI guide What Is 0.9% Sodium Chloride? (/guides/what-is-0-9-sodium-chloride). Checked 2026-11-01.
